#include <stdio.h>
void swap(int *x, int *y)
{
    int z;
    z=*x;
    *x=*y;
    *y=z;
    printf("\n*x=%d,*y=%d",*x,*y);
}

main( )
{
    int a= 10,b=20;
    swap(&a,&b);
    printf("\na=%d,b=%d\n",a,b);
}


